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Abstract

We report the realization of a tapered diode laser operated in a coupled ring cavity that significantly improves the coherence properties of the tapered laser and efficiently generates tunable light at the second harmonic frequency. The tapered diode laser is tunable with single-frequency output in the broad wavelength range from 1049 nm to 1093 nm and the beam propagation factor is improved from M2 = 2.8 to below 1.1. The laser frequency is automatically locked to the cavity resonance frequency using optical feedback. Furthermore, we show that this adaptive external cavity approach leads to efficient frequency doubling. More than 500 mW green output power is obtained by placing a periodically poled LiNbO3 crystal in the external cavity. The single frequency green output from the laser system is tunable in the 530 nm to 533 nm range limited by the LiNbO3 crystal. The optical to optical conversion efficiency exceeds 30%.

Fig. 3 (a) Generated second harmonic power (squares) as function of injection current to the tapered amplifier. The corresponding circulating fundamental power is also shown (dots). (b) Second harmonic power versus circulating fundamental power. The solid line is a fit to the measured values (squares).

Fig. 4 (a) Measured spectrum of the second harmonic light. The inset shows a FPI trace of the green light. (b) Tuning characteristics of the second harmonic wavelength with PPMgLN temperature. The black squares show wavelength and the red dots show the output power.